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タイトルヨミ
シンジコ セイブイキ ノ コテイ チケイ ト タイセキソウ
タイトル別表記
Topography and sedimentary layers of the westem part of Lake Shinji by echosounding
ファイル
言語
日本語
著者
田村 嘉之
中海・宍道湖自然史研究会
内容記述(抄録等)
The western part of Lake Shinji was surveyed by SH-20 echosounder to determine the topography and sediment layers to a depth of about 20m.Here,the Hii River Delta develops eastward,forming a subaqurous channel with natural levees on both sides.By comparing the present results with the bottom topography surveyed during 1962-63 by the Geographical Survey Institute,the Hii River Delta is shown to have prograded eastward about 1.5km.Several reflected layers are discovered in the bottom sediments.These layers increase in number toward the river mouths.To determine the composition of these reflectors,a 1.4m long sample was taken by gravity coring and was studied by soft-X Ray and grain size analyses.Two coarse layers were identified,which correspond to the reflected layers.These two layers are assinged to be flood deposits at A. D. 1934 and A. D. 1635,respectively.The rate of sedimentation is evaluated at 2-3mm/y(before 1635),3-4mm/y(between 1872 and 1934)and 7mm/y(after 1934).
掲載誌名
島根大学地球資源環境学研究報告
12
開始ページ
53
終了ページ
66
ISSN
13439774
発行日
1993-08-30
NCID
AA11455176
出版者
島根大学総合理工学部地球資源環境学教室
出版者別表記
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
資料タイプ
紀要論文
部局
(旧組織)大学院総合理工学研究科
備考
12-14,16+ / 1993+